Science · Year 4 · The Art of Inquiry · Term 3

Asking Scientific Questions

Students will learn to formulate testable questions that can be investigated through scientific inquiry.

• ACARA Content Descriptions
• AC9S4I01

About This Topic

Fair Testing is the cornerstone of scientific inquiry. In Year 4, students learn that for an experiment to be valid, they must change only one variable at a time while keeping all other conditions the same. This 'Cows Moo Softly' approach (Change one, Measure one, Samesies for the rest) helps students move from random play to systematic investigation.

This topic aligns with the ACARA Science Inquiry Skills strand. It teaches students to be critical thinkers who question the reliability of data. Whether they are testing which paper towel is the most absorbent or which ball bounces the highest, the focus is on the process of control. This topic comes alive when students can physically model the patterns of a fair test by identifying 'cheating' or 'unfair' elements in a mock experiment.

Key Questions

1. Differentiate between a scientific question and a non-scientific question.
2. Analyze how observations can lead to the development of a testable question.
3. Construct three scientific questions based on a given phenomenon.

Learning Objectives

• Identify the components of a testable scientific question.
• Analyze observations to formulate a scientific question.
• Construct three distinct scientific questions about a given phenomenon.
• Differentiate between scientific and non-scientific questions.

Before You Start

Making Observations

Why: Students need to be able to observe carefully and describe what they see to generate questions about phenomena.

Identifying Properties of Materials

Why: Understanding basic properties of objects helps students formulate questions about how those properties might change or be influenced.

Key Vocabulary

Scientific Question	A question that can be investigated through observation and experimentation, leading to measurable results.
Testable Question	A scientific question that can be answered by designing and conducting an experiment where variables can be controlled and measured.
Observation	The act of noticing and describing events or processes in a careful, orderly way, which can spark scientific inquiry.
Variable	A factor that can change or be changed in an experiment. In a fair test, only one variable is changed at a time.

Watch Out for These Misconceptions

Common Misconception

Students often think that changing multiple things at once will get them to the answer faster.

What to Teach Instead

Use a simple 'Mystery Box' activity. If you change the weight AND the shape of a ball, you won't know which one made it roll further. Peer discussion helps students realise that 'one change at a time' is the only way to be sure of the cause.

Common Misconception

The belief that a 'fair test' must always prove their prediction right.

What to Teach Instead

Reframe 'wrong' results as 'surprising data.' Use collaborative reflection to show that a fair test that proves a prediction wrong is just as valuable as one that proves it right, as both teach us something new.

Active Learning Ideas

Mock Trial: The Unfair Scientist

The teacher performs a deliberately 'unfair' experiment (e.g., testing which plant grows faster but giving one more water and the other more light). Students act as 'Science Detectives' to spot all the mistakes and explain why the results can't be trusted.

30 min·Whole Class

Inquiry Circle: The Great Paper Plane Race

Groups must design a fair test to see if the size of a paper plane affects how far it flies. They must agree on what to keep the same (the thrower, the paper type, the fold style) and what to change (the size), then carry out the test.

50 min·Small Groups

Think-Pair-Share: Variable Spotting

Show a photo of a scientist testing a new medicine or a car's safety. Ask: 'What is the one thing they are changing, and what are three things they must keep the same?' Students discuss in pairs and share their 'variable list' with the class.

20 min·Pairs

Real-World Connections

• Botanists at the Royal Botanic Garden Sydney ask testable questions about plant growth, such as 'How does the amount of sunlight affect the height of eucalyptus saplings?' to inform conservation efforts.
• Food scientists developing new snack products ask questions like 'Does the baking temperature affect the crispness of potato chips?' to ensure product quality and consistency for consumers.

Assessment Ideas

Exit Ticket

Provide students with a picture of a plant wilting. Ask them to write one non-scientific question and one testable scientific question about why the plant is wilting. Collect and review for understanding of scientific inquiry.

Discussion Prompt

Present the class with a scenario: 'You observe that ice melts faster on a sunny day than on a cloudy day.' Ask students: 'What scientific question could you ask based on this observation? What would you need to change to test it? What would you keep the same?' Facilitate a brief class discussion.

Quick Check

Give students a list of questions. Ask them to circle the questions that are testable scientific questions and put an 'X' next to the ones that are not. For example: 'Is blue a prettier color than red?' (non-scientific) vs. 'Does the color of a surface affect how quickly it heats up in the sun?' (scientific).

Frequently Asked Questions

What is a 'variable'?

A variable is anything that can change in an experiment. There are three types: the Independent variable (the one you change), the Dependent variable (the one you measure), and the Controlled variables (the ones you keep exactly the same to make it fair).

Why do we need to repeat tests in science?

Sometimes things happen by accident, a gust of wind or a shaky hand. By doing the same test three times and looking at the average, we can be more confident that our results are 'real' and not just a one-time fluke.

How can active learning help students understand fair testing?

Fair testing is a skill, not just a fact. Active learning, like the 'Mock Trial' or 'Paper Plane Race,' forces students to actually apply the rules of variables. When they have to defend their method to their peers, they think more deeply about why controls matter. This peer-to-peer accountability is much more powerful than a teacher simply telling them to 'keep it fair.'

Is it okay if my students' experiments 'fail'?

Absolutely! In science, a 'failed' experiment is just an experiment with an unexpected result. The real learning happens when students use active discussion to figure out *why* it didn't go as planned, was it an unfair variable or a faulty measurement?